JXL Regional Decoding Support

[OkyDooky]

Checklist

• I can reproduce the bug with the latest version given here.
• I made sure that there are no existing issues - open or closed - to which I could contribute my information.
• I made sure that there are no existing discussions - open or closed - to which I could contribute my information.
• I have read the FAQs inside the app (Menu -> About -> FAQs) and my problem isn't listed.
• I have taken the time to fill in all the required details. I understand that the bug report will be dismissed otherwise.
• This issue contains only one bug.
• I have read and understood the contribution guidelines.

Affected app version

1.2.1

Affected Android/Custom ROM version

All

Affected device model

All

How did you install the app?

GitHub releases

Steps to reproduce the bug

Open file, zoom in.

Expected behavior

Clarity should increase until the limits of the image's resolution are reached and exceeded.

Actual behavior

It maintains the initial display resolution and looks fuzzy when zooming in on that, even when the image is supposed to be very high resolution.

Screenshots/Screen recordings

No response

Additional information

This is caused by upstream issues beyond the reasonable scope of this app's development:

• API for region of interest decoding libjxl/libjxl#3519
• Ability to decode a section of the picture via x/y h/w with minimal I/O libjxl/libjxl#1623 (comment)

[OkyDooky]

Avif: #252